If people are interested - I am assuming this is ok to post since the site is public - https://unibuilder.dev/ includes a link to the online manual along the top menu bar.
for my purposes Unibuilder looks to be millions of miles better than godot's built in csg workflow. i've done it over and over in many projects and it's such a pain
btw im not the one who disliked your comment, i realize unibuilder might be more than what some people need, but MOST people will want what unibuilder has to offer compared to godots csg.